sharing/bday: fix date format

radicale/item/__init__.py

@@ -568,14 +568,10 @@ class Item:
         # set DTSTART
         dtstart = datetime.date(bdayY, bdayM, bdayD)
         item_ics.vevent.add('dtstart').value = dtstart
-        item_ics.vevent.dtstart.value_param = "DATE"
-        item_ics.vevent.dtstart.isNative = False
 
         # calculate and set DTEND
         dtend = dtstart + datetime.timedelta(days=1)
         item_ics.vevent.add('dtend').value = dtend
-        item_ics.vevent.dtend.value_param = "DATE"
-        item_ics.vevent.dtend.isNative = False
 
         # set UID
         if hasattr(self.vobject_item, "uid"):

radicale/tests/test_sharing.py

@@ -4285,8 +4285,8 @@ permissions: RrWw""")
             assert "BEGIN:VCARD" not in answer
             assert "BEGIN:VCALENDAR" in answer
             assert "RRULE:FREQ=YEARLY" in answer
-            assert "DTSTART;VALUE=DATE:1970-01-01" in answer
-            assert "DTEND;VALUE=DATE:1970-01-02" in answer
+            assert "DTSTART;VALUE=DATE:19700101" in answer
+            assert "DTEND;VALUE=DATE:19700102" in answer
             assert "TRANSP:TRANSPARENT" in answer
 
             # verify report as user